My patio neared completion over the weekend with my cutting pavers using a rented saw - went very well. Next I was to fill the joints with sand and per the ICPI site I needed to find astm C-144 sand or C-33 sand. When I went to Lowes I found the Quikrete all purpose meeting the C-33 and could not find any sand listing c-144. Is there a standard name for it? I bought the all purpose and it was painful trying to sweep it into the cracks since it had lots of little stones in it. It took 7 bags total with two applications but will need more (30 ft by 17 ft area). I would like to get some of the C-144 if possible and do the final sweeps with it and return the rest of the C-33. Anyone know what the c-144 is called in layman's terms? Is the c-144 a washed concrete sand?